Effect of elevated pCO <inf>2</inf> on the production of dimethylsulphoniopropionate (DMSP) and dimethylsulphide (DMS) in two species of Ulva (Chlorophyceae)

Kerrison, P; Suggett, DJ; Hepburn, LJ; Steinke, M

Effect of elevated pCO <inf>2</inf> on the production of dimethylsulphoniopropionate (DMSP) and dimethylsulphide (DMS) in two species of Ulva (Chlorophyceae)

Kerrison, P Suggett, DJ

Hepburn, LJ Steinke, M

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Publication Type:: Journal Article
Citation:: Biogeochemistry, 2012, 110 (1-3), pp. 5 - 16
Issue Date:: 2012-03-08

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Field	Value	Language
dc.contributor.author	Kerrison, P	en_US
dc.contributor.author	Suggett, DJ https://orcid.org/0000-0001-5326-2520	en_US
dc.contributor.author	Hepburn, LJ	en_US
dc.contributor.author	Steinke, M	en_US
dc.date.issued	2012-03-08	en_US
dc.identifier.citation	Biogeochemistry, 2012, 110 (1-3), pp. 5 - 16	en_US
dc.identifier.issn	0168-2563	en_US
dc.identifier.uri	http://hdl.handle.net/10453/28696
dc.description.abstract	Concentrations of the secondary algal metabolite dimethylsulphoniopropionate (DMSP) and its breakdown product, the climate-active trace gas dimethylsulphide (DMS), are sensitive to changes in pCO 2. Data on the response of marine macroalgae to future pCO 2 levels are lacking. Here we report the first measurements of DMSP and DMS production in two species of chlorophyte macroalgae (Ulva lactuca and U. clathrata). Laboratory cultures were grown in pH-stated medium that received pulses of CO 2 to create pCO 2 conditions ranging from ambient (432 μatm) to future (1514 μatm). Intracellular concentration of DMSP remained unaffected in both species (101 ± 21 and 69 ± 20 mmol g -1 FW in U. lactuca and U. clathrata, respectively) but significant differences in extracellular production of DMSP and DMS were observed for U. lactuca: Whilst production of total DMSP (the sum of external DMSP and DMS) was different between replicated experiments, the percentage of total DMSP produced throughout each experiment increased significantly by up to 65% with increasing pCO 2 to 1514 μatm. In contrast, DMS production decreased from 0. 4 to 0. 25 nmol g -1 FW h -1. This decrease was not a linear function of pCO 2 but an almost 50% step-wise loss of DMS production was indicated between 635 and 884 μatm, a pCO 2 predicted for the next 100 years. Since Ulva spp. form massive harmful blooms ('green tides') that can occur free-floating and faraway (>100 km) from the coast, they may provide a locally significant source of DMS to the remote marine boundary layer. © 2012 Springer Science+Business Media B.V.	en_US
dc.relation.ispartof	Biogeochemistry	en_US
dc.relation.isbasedon	10.1007/s10533-012-9707-2	en_US
dc.subject.classification	Agronomy & Agriculture	en_US
dc.title	Effect of elevated pCO <inf>2</inf> on the production of dimethylsulphoniopropionate (DMSP) and dimethylsulphide (DMS) in two species of Ulva (Chlorophyceae)	en_US
dc.type	Journal Article
utslib.citation.volume	1-3	en_US
utslib.citation.volume	110	en_US
utslib.for	0399 Other Chemical Sciences	en_US
utslib.for	0502 Environmental Science and Management	en_US
utslib.for	0402 Geochemistry	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Strength - C3 - Climate Change Cluster
utslib.copyright.status	closed_access
pubs.declined	1970-01-01T00:00:00.0+1000
pubs.deleted	1970-01-01T00:00:00.0+1000
pubs.issue	1-3	en_US
pubs.publication-status	Published	en_US
pubs.volume	110	en_US

Abstract:

Concentrations of the secondary algal metabolite dimethylsulphoniopropionate (DMSP) and its breakdown product, the climate-active trace gas dimethylsulphide (DMS), are sensitive to changes in pCO 2. Data on the response of marine macroalgae to future pCO 2 levels are lacking. Here we report the first measurements of DMSP and DMS production in two species of chlorophyte macroalgae (Ulva lactuca and U. clathrata). Laboratory cultures were grown in pH-stated medium that received pulses of CO 2 to create pCO 2 conditions ranging from ambient (432 μatm) to future (1514 μatm). Intracellular concentration of DMSP remained unaffected in both species (101 ± 21 and 69 ± 20 mmol g -1 FW in U. lactuca and U. clathrata, respectively) but significant differences in extracellular production of DMSP and DMS were observed for U. lactuca: Whilst production of total DMSP (the sum of external DMSP and DMS) was different between replicated experiments, the percentage of total DMSP produced throughout each experiment increased significantly by up to 65% with increasing pCO 2 to 1514 μatm. In contrast, DMS production decreased from 0. 4 to 0. 25 nmol g -1 FW h -1. This decrease was not a linear function of pCO 2 but an almost 50% step-wise loss of DMS production was indicated between 635 and 884 μatm, a pCO 2 predicted for the next 100 years. Since Ulva spp. form massive harmful blooms ('green tides') that can occur free-floating and faraway (>100 km) from the coast, they may provide a locally significant source of DMS to the remote marine boundary layer. © 2012 Springer Science+Business Media B.V.

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